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Note 19 - Tax assets and liabilities - Deferred Taxes - Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets And Liabilities Abstract      
Deferred tax assets at the beginning € 14,725 € 16,391 € 15,878
Changes On The Exercise Assets Abstract      
Pensions Deferred Tax Assets 10 (795) 168
Portfolio Deferred Tax Assets (52) 82 (103)
Other Assets Deferred Tax Assets (55) (305) 108
Impairment Losses Deferred Tax Assets 370 (385) 44
Other Deferred Tax Assets 120 (366) 255
Secured Tax Deferred Tax Assets (70) 2 (105)
Tax Losses Deferred Tax Assets 268 101 146
Change for Income Tax and Other Taxes Deferred Tax Assets 0 0 0
Deferred tax assets at the end € 15,316 € 14,725 € 16,391